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ASP4

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  use strict;
  use warnings 'all';
  use base 'App::db::model';
  
  __PACKAGE__->set_up_table('messages');
  
  __PACKAGE__->belongs_to(
    sender  =>
      'App::db::user' =>
        'from_user_id'
  );
  
  __PACKAGE__->belongs_to(
    recipient =>
      'App::db::user' =>
        'to_user_id'
  );
  
  1;# return true:

Create your MasterPage like this:

File: C<htdocs/masters/global.asp>

  <%@ MasterPage %>
  <!DOCTYPE html>
  <html>
    <head>
      <title><asp:ContentPlaceHolder id="meta_title"></asp:ContentPlaceHolder></title>
      <meta charset="utf-8" />
    </head>
    <body>
      <h1><asp:ContentPlaceHolder id="headline"></asp:ContentPlaceHolder></h1>
      <asp:ContentPlaceHolder id="main_content"></asp:ContentPlaceHolder>
    </body>
  </html>

File: C<htdocs/index.asp>

  <%@ Page UseMasterPage="/masters/global.asp" %>
  
  <asp:Content PlaceHolderID="meta_title">Register</asp:Content>
  
  <asp:Content PlaceHolderID="headline">Register</asp:Content>
  
  <asp:Content PlaceHolderID="main_content">
  <%
    # Sticky forms work like this:
    if( my $args = $Session->{__lastArgs} ) {
      map { $Form->{$_} = $args->{$_} } keys %$args;
    }
    
    # Our validation errors:
    my $errors = $Session->{validation_errors} || { };
    $::err = sub {
      my $field = shift;
      my $error = $errors->{$field} or return;
      %><span class="field_error"><%= $Server->HTMLEncode( $error ) %></span><%
    };
  %>
  <form id="register_form" method="post" action="/handlers/myapp.register">
    <p>
      <label>Email:</label>
      <input type="text" name="email" value="<%= $Server->HTMLEncode( $Form->{email} ) %>" />
      <% $::err->("email"); %>
    </p>
    <p>
      <label>Password:</label>
      <input type="password" name="password" />
      <% $::err->("password"); %>
    </p>
    <p>
      <label>Confirm Password:</label>
      <input type="password" name="password2" />
      <% $::err->("password2"); %>
    </p>
    <p>
      <input type="submit" value="Register Now" />
    </p>
  </form>
  </asp:Content>

The form submits to the URL C</handlers/app.register> which means C<handlers/app/register.pm>

File: C<handlers/app/register.pm>

  package app::register;
  
  use strict;
  use warnings 'all';
  use base 'ASP4::FormHandler';
  use vars __PACKAGE__->VARS; # Import $Response, $Form, $Session, etc
  use App::db::user;
  
  sub run {
    my ($self, $context) = @_;
    
    # If there is an error, return the user to the registration page:
    if( my $errors = $self->validate() ) {
      $Session->{validation_errors} = $errors;
      $Session->{__lastArgs} = $Form;
      $Session->save;
      return $Response->Redirect( $ENV{HTTP_REFERER} );
    }
    
    # Create the user:
    my $user = eval {
      App::db::user->do_transaction(sub {
        return App::db::user->create(
          email     => $Form->{email},
          password  => $Form->{password},
        );
      });
    };
    
    if( $@ ) {
      # There was an error:
      $Session->{validation_errors} = {email => "Server error.  Sorry!"};
      $Session->{__lastArgs} = $Form;
      $Session->save;
      return $Response->Redirect( $ENV{HTTP_REFERER} );

lib/ASP4.pm view on Meta::CPAN

      }
    }
    else {
      $errors->{password2} = "Required";
    }
    
    # Bail out of we already have errors:
    return $errors if keys %$errors;
    
    # See if the user already exists:
    if( App::db::user->count_search( email => $Form->{email} ) ) {
      $errors->{email} = "Already in use";
    }
    
    # Errors or not?:
    keys %$errors ? return $errors : return;
  }
  
  1;# return true:

File: C<htdocs/profile.asp>

  <%@ Page UseMasterPage="/masters/global.asp" %>
  
  <asp:Content PlaceHolderID="meta_title">My Profile</asp:Content>
  
  <asp:Content PlaceHolderID="headline">My Profile</asp:Content>
  
  <asp:Content PlaceHolderID="main_content">
  <%
    if( my $msg = $Session->{msg} ) {
  %>
    <div class="message"><%= $msg %></div>
  <%
    }# end if()
  %>
  
  <%
    # Get our $user:
    use App::db::user;
    my $user = App::db::user->retrieve( $Session->{user_id} );
  %>
  
  <div style="float: left; width: 40%; border-right: solid 1px #000;">
    <h3>Incoming Messages</h3>
  <%
    foreach my $msg ( $user->messages_in(undef, { order_by => "created_on ASC"} ) ) {
  %>
    <div class="msg">
      <span class="from"><%= $msg->sender->email %></span> says:<br/>
      <div class="body"><%= $Server->HTMLEncode( $msg->body ) %></div>
      <span class="date"><%= $msg->created_on %></span>
    </div>
  <%
    }# end foreach()
  %>
  </div>
  
  <div style="float: right; width: 40%; border: dotted 1px #000;">
    <h3>Send New Message</h3>
    <form id="send_form" method="post" action="/handlers/app.send">
      <p>
        <label>Recipient:</label>
        <select name="to_user_id">
  <%
    my @users = App::db::user->search_where({
      user_id => {'!=' => $user->id }
    }, {
      order_by => "email"
    });
    foreach my $user ( @users ) {
  %>
          <option value="<%= $user->id %>"><%= $Server->HTMLEncode( $user->email ) %></option>
  <%
    }# end foreach()
  %>
        </select>
      </p>
      <p>
        <label>Subject:</label>
        <input type="text" name="subject" maxlength="100" />
      </p>
      <p>
        <label>Message:</label><br/>
        <textarea name="body"></textarea>
      </p>
      <p>
        <input type="submit" value="Send Message" />
      </p>
    </form>
  </div>
  </asp:Content>

The form submits to C</handlers/app.send> which maps to C<handlers/app/send.pm>

File: C<handlers/app/send.pm>

  package app::send;
  
  use strict;
  use warnings 'all';
  use base 'ASP4::FormHandler';
  use vars __PACKAGE__->VARS;
  use App::db::user;
  use App::db::message;
  
  sub run {
    my ($self, $context) = @_;
    
    # Create the message:
    my $msg = eval {
      App::db::message->do_transaction(sub {
        my $msg = App::db::message->create(
          from_user_id  => $Session->{user_id},
          to_user_id    => $Form->{to_user_id},
          subject       => $Form->{subject},
          body          => $Form->{body},
        );
        
        # Send an email to the recipient:
        $Server->Mail(

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